#include<stdio.h>
#define M 100

int main()
{
  printf("M=%d",M);
  printf("hello 24_1_27 , nice day!");
  
 // printf("hello 24_1_27 , nice day!");
 // printf("hello 24_1_26 , nice day!");
  printf("hello 24_1_25 , nice day!");
  printf("hello 24_1_24 , nice day!");
  printf("hello 24_1_23 , nice day!");
  printf("hello 24_1_22 , nice day!");
  printf("hello 24_1_21 , nice day!");
  printf("hello 24_1_20 , nice day!");

  //条件编译
#ifdef DEBUG
  printf("hello debug!\n");
#else
  printf("hello release\n");
#endif

}
